Hi Thank you for your help I type the ifconfig -a there is ipv6 address inet6 fe80::20c:29ff:fe3c:92a1/64 scope link tentative i also add one inet6 2001:db8:cafe:1111::12/64 scope global tentative but both are not pingable by ping6 Here are commands you suggested me to run route -n -A inet6 Kernel IPv6 routing table Destination Next Hop Flags Metric Ref Use Iface 2001:db8:cafe:1111::/64 :: U 256 0 0 eth0 fe80::/64 :: U 256 0 0 eth0 ::1/128 :: U 0 2 1 lo ff00::/8 :: U 256 0 0 eth0 ip -6 route 2001:db8:cafe:1111::/64 dev eth0 metric 256 expires 21334307sec mtu 1500 advmss 1440 hoplimit 4294967295 fe80::/64 dev eth0 metric 256 expires 21330690sec mtu 1500 advmss 1440 hoplimit 4294967295 I can't ping ipv6.google.com but I should ping the eth0 ipv6 as it is host ip address. Right? Thank you for your help. --- On Tue, 3/8/11, Jakub Jedelsky <jakub.jedelsky at gmail.com> wrote: > From: Jakub Jedelsky <jakub.jedelsky at gmail.com> > Subject: Re: [CentOS] what wrong about my ipv6 address > To: "CentOS mailing list" <centos at centos.org> > Received: Tuesday, March 8, 2011, 3:36 AM > Dne 7.3.2011 20:56, ann kok > napsal(a): > > Hi > > > > I used the command "ip -6 addr add > 2001:DB8:CAFE:1111::12/64 dev eth0" > > > > to add ipv6 address and can see it in ifconfig > > > > but can't ping it > > > > Why? > > > > Thank you > > > > # ping6 2001:db8:cafe:1111::12 > > PING 2001:db8:cafe:1111::12(2001:db8:cafe:1111::12) 56 > data bytes > >>From ::1 icmp_seq=1 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=2 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=3 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=5 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=6 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=7 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=9 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=10 Destination unreachable: > Address unreachable > >>From ::1 icmp_seq=11 Destination unreachable: > Address unreachable > > > > > > hi, > > have you correctly set gateway? Send `ip -6 route` and > `route -n -A > inet6` to us. What about to ping ipv6.google.com from this > pc? > Where did you run ping command? Have you IPv6 enabled > there? "From ::1" > looks like something is misconfigured.. > > JJ > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >